Photo by Felix Mittermeier from Pexels
The arrangements should be playable by grade 1-2 level students.
As I teach in Wales during my working week, some of my primary school students have been learning this tune on guitar or ukulele to play at school events to mark St. David’s day.
By some, the song is considered a traditional Welsh Christmas song. I’m not too sure on this, but it says on wikipedia here: https://en.wikipedia.org/wiki/Ar_Hyd_y_Nos
2017 update: Now includes a lyrics file.